Posted 16 October 2009 - 01:50 AM

Posted 16 October 2009 - 01:46 PM

srs5694

InsanelyMac Legend

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Location:Woonsocket, RI

Windows 7 does support reading and writing GPT disks, but not booting from them, unless the computer uses EFI for firmware, rather than a BIOS. (I've corresponded with somebody who's used a post-BIOS EFI implementation to work around this limitation, but that's currently an awkward solution that doesn't work on all computers -- I couldn't get it to work myself, for instance.) So in a dual-boot environment with Windows and a need or desire to use GPT, you must have either multiple disks (at least one MBR for Windows to boot and at least one GPT) or a hybrid MBR configuration.

Posted 18 December 2009 - 08:23 PM

Posted 18 December 2009 - 08:29 PM

Suzuka

InsanelyMac Legend

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691 posts

Windows 7 does support reading and writing GPT disks, but not booting from them, unless the computer uses EFI for firmware, rather than a BIOS. (I've corresponded with somebody who's used a post-BIOS EFI implementation to work around this limitation, but that's currently an awkward solution that doesn't work on all computers -- I couldn't get it to work myself, for instance.) So in a dual-boot environment with Windows and a need or desire to use GPT, you must have either multiple disks (at least one MBR for Windows to boot and at least one GPT) or a hybrid MBR configuration.

Posted 11 November 2010 - 08:12 AM

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Posted 16 November 2010 - 06:51 PM

xbox361

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Fortunately, boot can be easily unset the same way you set it (using parted). But, when you do so, at least using the version of parted that comes with Ubuntu Gutsy, the msftres flag is set, and parted won't let you unset it no matter how many times you try. The main problem this caused for me was that the partitions marked as msftres would no longer be mounted automatically by OS X, so they didn't show up in the Finder, and they were grayed out in Disk Utility. diskutil list indeed showed their type as "Microsoft Reserved Data" or something to that effect. (I don't remember exactly, and I didn't feel like changing the type back just to do testing for this hint.)

Posted 21 November 2010 - 11:34 PM

BugsB

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Usage: gptsync [OPTION]... DEVICE [PARTITION[+/-[TYPE]]] ...

gptsync fill hybrid MBR of GPT drive DEVICE.

Specified partitions will be a part of hybrid MBR. Up to 3 partitions are allowed.
+ means that partition is active (only one partition can be active).
TYPE is an MBR hexadecimal type (use -t option to list recognized types).